Window-sash balance.



S. GARLSON, S. JOHNSON & 0. OLSON.

WINDOW SASH BALANGE. 4 PPLIUATION FILED MAY 25. 1908. 908,202, Patented Dec. 29, 1908.

2 SHEBTSSHEET 1.

S. CARI-SON, SQ JOHNSON & 0. OLSON. WINDOW SASH BALANCE.

APPLICATION FILED MAY 25. 1908.

Patented Dec. 29, 1908.

I 2 SHBETS-SHEET 2.

SOYL son UNITED snares rarer OFFICE.

SWAN OARLSON, SWAN JOHNSON, AND OTTO OLSON, OF CHICAGO, ILLINOIS.

WINDOW-SASH BALANCE.

To all whom it may concern:

Be it known that we, SWAN GAnLsoN, SWAN JOHNSON, and Or'ro OLsoN, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful 1m provements in WVindow-Sash Balances, of which the following is a specification.

Our invention relates to building construction, and has particular reference to improvements in means for counterweighting window sash.

The object of the invention is to dispense with the usual weighted cords, chains, straps, and the like flexible connections which run over pulleys and are a frequent source of expense for repairs.

Our invention further contemplates sash balancing means which may be locked so as to hold a window sash in a fixed open position and prevent its further opening from without, and thus serve as a protection against burglars.

With the above named objects in view our invention consists in the novel construction, combination and arrangement of parts hereinafter described in detail, illustrated in the drawings and incorporated in the appended claims.

In the drawings-Figure 1 is a front elevation of a window having our invention applied thereto, same being partly in section. Fig. 2 is an enlarged section of same. Fig. 3 is an enlarged horizontal section taken on line 33 of Fig. 1. Fig. 4 is a perspective view of a section of one of the toothed racks carrying the counterweights. Fig. 5 is a similar view of the gear racks which are attached to the window sash.

In the several views, 2 represents the win dow frame, at each vertical side of which is provided the usual space, compartment or inclosure 3 wherein counterweights 4 and 5, for, respectively, the lower and upper sash, are suspended. The construction being the same for each side of the window sashes and frame, only one side is shown and a description of same will suiiice for both.

To the rear side of the jamb 6 of the window frame is secured a pair of, preferably, wooden rails or strips 7 and 8 which thus project into the space 3. The rail 7 serves the lower sash and the rail 8 serves the upper sash, as will be more fully described hereinafter. To the sides of these rails 7 and 8 are secured sheet metal strips 9 and 10 which Specification of Letters Patent.

Application filed May 25, 1908.

Patented Dec. 29, 1908.

Serial No. 434,745.

lie fiat against the sides of the rails and beyond the free edges thereof are bent twice at right angles so as to form pairs of rectangular channels 11 and 12 which face each other, as shown in Fig. 3. These channels form guide-ways for flanges 13 and 14 of gear racks 15. On the racks 15 are hooks 16 from which the counterweights 4 and 5 are suspended. The equipment for each of the rails 7 and 8 being the same a description of the construction in connection with one of said rails will therefore suffice for both. Referring to, say, rail 7 andthe adjacent frame rail 17 of the lower sash, a gear wheel 19 is revolubly mounted in an opening 20 which passes through the rail 7 and the jamb 6. The diameter of the pitch circle of the wheel 19 is equal to the combined thicknesses of the rail 7 and the jamb 6 in the plane of the sash. Hence the teeth only of the wheel project beyond the respective opposite faces of the jamb 6 and the rail 7, as shown in Fig. 2.

Into the side of the sash rail which faces the jamb, is mortised a gear rack 21, and said gear rack is sunk into the sash sothat the tips of the teeth of the rack are flush with the face of the sash rail, as shown in Figs. 2 and 3. The gear rack 21 may be secured in the sash groove made for same in any suitable manner, such as by screws 22 whose heads are sunk into counterbores of screw holes 23 in the rack. In order to enable the sash rails 17 and 18 to clear the projecting teeth of the wheels 19 when the sashes are to be removed, said rails 17 and 18 are rabbeted or cut away at 24 and 25. Thus when the usual retaining mold strip 26 is removed, together with the intermediate strip 27 the sashes may be removed in the usual manner.

The positions of the respective gear racks when each sash is in its lowermost position, is shown in Fig. 1 where the upper end of the rack 21 and the lower end of the rack 15 are engaged by the wheel 19. Vhen a sash is raised from such position the rack 21 rotates the wheel 19 to the right, or in the direction of the arrow in the wheel 19 in Fig. 2, which lowers the rack 15 to the same extent as the rack 21 is raised, which move ments are reversed by the downward movement of a sash.

Provision is made for holding a partly open or closed window sash against either up or down movement, by locking the gear wheels 19 against rotary movement. This is accomplished by inserting a pin 28 between teeth or cogs in the wheel 19. This pin is slidably mounted in a bore 29 in the window frame and jamb, at right angles to the plane of the wheel 19 and sash and in the path of the teeth on the wheel. In the jamb the bore is enlarged at 30 and in this enlarged portion is a collar 31 secured to, or shrunk upon the pin 28 so as to limit the longitudinal movement of the later to the extent of the enlargement or counterbore 30. In Fig. 3 the wheel 19 for the lower sash is shown engaged by the pin 28. In Fig. 1 four pins are shown the knobs 32 indicating the positions of the pins at the left and die pins themselves being indicated at 28, 28 to the right in said Fig. 1. Ordinarily only one pin for each sash is required.

Aside from its utility for the purpose of locking a sash in an open position not suiticient to admit a burglar, the pins serve to hold the sash weights and the racks upon which they are hung, from falling down when the sash are temporarily removed from the window frame.

e claim as our invention- 1. The combination with the sash and wlndow-frame, the lattenhavmg a weight compartment 3 and the jamb 6 therein, of a rail secured to the rear face of said jamb and projecting into said space 3, a weighted rack-bar, guide-ways 11 and 12 upon said rail slidably supporting said weighted rackbar, a sash-rack-bar mortised into the surface of said sash and facing said jamb, an opening 20 through said jamb and rail, a toothed wheel revolubly mounted in said opening and meshing with said rack-bars, said wheel transmitting to said sash the 'c'ounterpoise weight of the weighted rackbar.

2. The combination with the windowsa'shes and window-frame having the compartment 3 and the jamb G, of the rails T and 8 secured to the rear face of said jam'b and within said space '3, the openings 20 through said rails and jamb, the wheels 19 mounted in said openings, the rack-bars 15 having weights thereupon, the guide-ways 11 and 12 secured to said rails and supporting said rack-bars 15 in mesh with said wheels 19, and the rack-bars 21 in said sashes which also mesh with said wheels 19.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

SWVAN CARLSON. SlVAN JOHNSON. OTTO OLSON. Vitnesses M. O. ALLEN, J. WV. BEGKSTROM. 

